The polygon motor is part of the laser assembly, other wise know as the ROS, Raster Output Scanner.It normally is not as simple as replacing the ros and moving on.There are color registration adjustments to be done once the ROS is replaced. You can try contacting https://www.partsdrop.com/store/and seeing if they have one. That motor has the mirrors on it that rotate to focus the laser to the belt assembly.

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That means that the Laser Unit is bad. I have fixed that error, by tahking the Laser Ubit's housing apart and removing the toner that accumalayes on the Laser itself. Proceed carefully, wipe tone off with cotton balls. If this does not fix it, it is the Laser Unit needing replacement.

The polygon motor failure is referring to the Laser Unit (part# - 116-1110-00). This issue somewhat common on the Xerox 7700. Unfortunately the laser unit must be replaced and is pretty expensive (around $1000) Replacing it isn't too hard though, just remove the right side cover and unscrew the two screws on the laser unit and unplug the two cables from the laser to the engine control board. If you do decide to repair the machine iteminc.com has the part online.

THIS IS THE TEXT FROM THE PHASER 7700 SERVICE MANUAL, HOWEVER, SEE MY COMMENTS AT THE END OF THE QUOTE.

11 06-372 ERROR 11 LASER UNIT POLYGON MOTOR FAILURE
Note If this failure reoccurs three times successively, an Engine NVRAM
value is set preventing further printer use until the Clear Tech Rep
Fault, Clear <09-380 ~ 09-383> is run.
Remove Rear Cover (RRP 1, on page 7-154).
Disconnect P400 (see figure page 2-46) and P401 (see figure page 2-46) on the Engine Control
Board.
Inspect both connectors to determine they are fully engaged as a unit. Re-engage, if necessary.
Note The two connectors can NOT properly seat into their socket(s)
unless they are both engaged as a unit. Ensure there is no
separation.
Carefully reinsert the plugs into their joint socket and FIRMLY seat them.
Replace the Laser Unit (RRP 38, on page 7-200).
Note Whenever the mounting screws for the Laser Unit have been
loosened, it is necessary to recalibrate the unit by performing the
RegiCon Adjustment Procedure beginning on page 4-124.
If the problem persists, replace the Engine Control Board (RRP 42, on page 7-206).

This error usually means that the laser unit on the machine has failed. Just replace the laser unit part number 116-1110-00. I've bought couple of them from www.iteminconline.com. They also give good customer service for free and I think 30 day return if the part is not working. hopefully this helps